Nickel Calibration Test
by MrJohn, published
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After having some minor problems getting circles right and trying to get 608 bearings into my printed parts, I created this simple test to verify I had round holes.
An American nickel is 21.21mm in diameter, and 1.95mm in thickness. Ref(http://www.usmint.gov/faqs/circulating_coins/?action=faq_circulating_coin)
This test has an internal diameter of 22.0mm (what's 0.69mm between friends?) and a height of 1.95mm.
This test will also be a good and quick test of the "Bottom" setting, and a good way to ensure the "Fill" settings are making solid top layers.
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Print and place nickel in the middle. Make adjustments to your printer if needed, print again.
As there are far too many calibration issues that you may run into for me to cover here, I'll direct you to the calibration page on the reprap wiki-
It basically comes down to changing the steps per mm in the firmware.
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Nickel Calibration Test by MrJohn is licensed under the Creative Commons - Attribution - Share Alike license.
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